3. STUDY DESIGN This protocol describes a prospective, open, randomized controlled trial with two study arms. All patients receive standard care of monitoring performed by the medical staff. The study examines whether capnography prevents patients from having respiratory events during deep sedation in abortion procedures.Patients randomized to the standard care group receive standard of care using pulse oximetry. In the capnography arm, respiratory monitoring is performed with pulse oximetry and capnography. If the capnogram indicates sub-optimal ventilation and/or apnea, denoted as a flat line on the capnometer for ≥ 15 seconds, a respiratory rate ≤ 6, or a end-tidal CO2 > 50 mmHg, medical staff will intervene by arousing the patient, performing chinlift or jawthrust, abandon from giving additional propofol, or provision of oxygen. The nurse qualified in sedation management will assess capnography him/ herself. Medical staff and patients are not blinded for the allocation assignment and the study has an open design.